Saw for sawing trees



Apr.v 3, 1923.

H. BONER SAW FOR SAWING TREES Filed Mar. 16, 1921 INVENTOR. Hans Boncr'.

/ ATTO/wey Patented Apr. 3, 1923.

UNITED STATES HANS BONER, 0F MADULEIN, SWITZERLAND.

SAW FOR SAWING TREES.

Application led March 16, 1921. Serial No. 452,777.

To aZZ whom t may concern Be it known that I, HANS BONER, me chanic, citizen of the Republic of Switzerland, residing at Madulein, in the Canton of the Grisons, Switzerland, have invented certain new and useful Improvements in Saws for Sawing Trees (for which I have filed an application in Switzerland March 8, 1920, Patent No. 87,001), of which the following is a specification.

The subject o-f the present invention is a saw for sawing down trees, an embodiment of which is represented on the accompanying drawing, viz:

Fig. 1 shows an elevation partly in section.

Fig. 2 section along the line A-B of Fig. 1, and

Fig. 3 shows a side View.

Fig. 4 isl a substantially longitudinal sectional view of the speed pulley gears and means for changing the operating speed of the machine.

a is a casing provided at two opposite sides with a slot b for the guidance of a pushrod c which carries the blade of the saw d. At each of these sides three plugs e are placed, capable of being turned and shifted, to which movable props f can be iixed. These props serve the purpose of supporting the casing on the ground.

The push-rod c is supported in the slots Z; by means of the nuts g through which pass spindles la. These are operated from a common shaft c by means of a pair of bevel gearwheels z', so that the push-rod c can be shifted along the slots b parallel to each other. On the other hand the push-rod c can be shifted longitudinally thereof in the nuts g.

At the end of the shaft lo exteriorly of the casing a a hand-wheel Z is fixed and a chainwheel m is loosely carried on said shaft. On the sides turned towards themselves the naves of Z and m are fitted with clutch teeth in order to be able to connect Z and m with each other. The coupling and uncoupling is done by means of an adjustable hand-lever a, which can rbe iixed firmly.

The chain-wheel m is driven by means of a chain o from the shaft p which is driven from a motor g by means of a chain -r and a speed pulley-gearing s. Operating axially within the shaft p is a slide member 1 having a radially projecting lug 2 at its inner l end and a knob 3 attached to the opposite end thereof outside of the shaft p. The wall of the shaft p is provided with a slot 4 extending' substantially the entire length of the three gears s which are loosely mounted upon the shaft itself and which are provided with keyways 5 cut longitudinally of their hubs. The lug 2 of the slide member 1 projects through the slot a and into one of the keyways 5 of the gears s so that but one of the latter may be positively driven at a time. With this construction the change of speed ofthe gears is effected by moving the slide member l to any of the three positions possible to engage the gears on the shaft p with the driving gears s, in` which case the two unengaged gears will rotate freely about the shaft p at rates of speed determined by the size of the driving gears. In operation it is only possible to change the speed of the device by first stopping the machine. On the shaft p a wheel t is fixed bearing near its circumference a lateral pin u, which engages a slot o1 of a frame w. A transverse plug w fixed to the push-rod c engages loosely a front slot @2 parallel to o1 of frame w which consists of two plates, spaced apart from each other. The frame fw is so attached to two rods y parallel to the push-rod, that it can be shifted.

The turning of the wheel therefore causes a shifting of the frame along the rods, forwards and backwardsand this shifting imparts similar motion to the push-rod c, i. e. it moves the blade of the saw.

At the same time the screw-spindles 7LV turn and therefore the blade of the saw moves parallel to these and is moved forwards.

The drawing represents the saw in the position, in which it can saw through the trunk of a tree which is lying on the ground. But if the tree has to be sawn down, I take outthe props f below to the right in Fig. 3, on both sides of the casing stick them above to the left in the plug e loosen the plug e (below to the left) so far that the casing a can turn round them, turn the same to the left by 900, fix the posts firmly and then the work can begin, the blade of the saw now lying horizontally. The latter is from time to time brought towards the trunk by means of the hand-wheel m, before the coupling between Z and m is made and the motor is turned on.

In order to operate the motor g in either horizontal or vertical position, the carburetor may be constructed so that inlet and outlet pipes form the journals about which the body of the carburetor revolves, as the p0siciprocation, such means for reciprocation comprising a guide frame or cross head slot* ted in the direction of feed of said saw, a rotating part having a pin, and a saw carrying bar hav-ing a pin, each engaged in the slotted cross-head so that the rotation of said part reciprocates the cross-head and the secof the saw.

In testimony whereof I have. affixed .my

sign atnre.

HANS BQNER.

`ond pin travels ytherein during the feeding 20 

